Thermosetting bismaleimide/reactive rubber blends: Curing kinetics and mechanical behavior

Abstract

A maleimido-terminated butadiene-acrylonitrile copolymer was employed as an impact modifier for a commercial thermosetting bismaleimide resin. FTIR spectroscopy was used to monitor in real time the kinetics of the curing process in this blend system at different temperatures. The toughening agent was found to produce strong effects on the kinetics and mechanism of the curing process. The fracture toughness parameters K c and G c showed a substantial enhancement as the rubber content in the blend was increased. Only a modest reduction of the elastic modulus and of the compressive yield stress was brought about by incorporation of the impact modifier.

Preparation and properties of polymer alloys consisting of high-molecular-weight benzoxazine and bismaleimide

“…22,26 Bismaleimide resins have been expected as a series of thermosets that have higher thermal properties than epoxy resins, but the brittleness of the cured bismaleimide is a major drawback. Toughening of bismaleimide has been attempted, [43][44][45][46][47][48][49][50] but often resulted in reducing the heat resistance.…”

Indane‐based bismaleimide and cloisite 15a nanoclay blends: Kinetics of thermal curing and degradation of particulate nanocomposites

“…Apart from the excellent thermal stability, polybismaleimides possess good mechanical properties, high chemical resistance, and low dielectric constant, and it is widely used in many applications as semiconductor devices, printed circuit boards, microelectronics, automotive, and aerospace sectors .…”

“…On the other hand, bismaleimide resins are very brittle in nature, show poor solubility in organic solvents, possess narrow processing window, and leads to materials having high crosslinking density . Addition of reactive elastomers and toughening agents , Micheal addition chain extension , and modifications with thermoplastics are different approaches made to overcome the limitations encountered in bismaleimide resins. The dispersion of clay particles in polymer matrix is one of the methods that have been well established to improve the properties of the materials since 1960s .…”

Bismaleimides and biscitraconimides: Synthesis and properties

“…12 BMI resins can be easily processed, but most BMIs also have a number of disadvantages, such as brittleness (because of their high crosslink density), a high melting temperature, and curing temperature. [13][14][15] Further attempts have been made to improve the processability and properties of BMI resins, for example, by the introduction of various substituents into the aromatic rings or flexible bridges in the main chain. In this study, we examined the influence of monomer structure on the solubility, reactivity, and thermal properties of these compounds.…”